#5772: Failed kind inference in class declaration (regression error)
---------------------------------------+------------------------------------
Reporter: goldfire | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type
checker)
Version: 7.4.1-rc1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Testcase:
Blockedby: | Blocking:
Related: |
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Consider the following code:
{{{
{-# LANGUAGE MultiParamTypeClasses
#-}
class Foo a b
class Foo a b => Bar a b where
baz :: a b
}}}
This compiles fine in 7.2.1 but fails in 7.4.1-rc1, with the following
error:
{{{
Sandbox.hs:7:12:
`a' is applied to too many type arguments
In the type `a b'
In the class declaration for `Bar'
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5772>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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